Ship&#39;s davit.



W. LUEDER.

SHIP'S DAVlT.

APPLICATION FILED JUNE 10. 1915.

1,178,821 Patented Feb.29,1916.

3 SHEETS- SHEET l- WITNESSES: INVENTOR.

ATTORNEY.

THE COLUMBIA PLANOGRAPH co.. WASHINGTON, D. c.

W/LL/FIM AL/EUER W. LUEDER.

SHIPS DAVIT. APPLICATION HLEDIJUNE 10, 1915.

lNVE/V TOR. WILL/Fl M LUEDEFL WIT/V 5 5.-

THE COLUMBIA PLANOGRAPH cm, WASHINGTON, D C.

piairnn STATES PATENT orrreia WILLIAM LUEDER, OF SAN FRANCISCO,CALIFORNIA.

SHIPS DAVIT.

To all whom it may concern Be it known that I, W'ILLIAM LUEDER, asubject of the Emperor of Germany, residing at 363 Second avenue, SanFrancisco, in the county of San Francisco, State of California, haveinvented a. new and useful,

Ships Davit, of which the following is a specification in such full andclear terms as will enable those skilled in the art to construct and usethe same. 7 A

This invention relates to a davit for ships and one of the objects ofthe invention is to provide means whereby a series of davits may beoperated all at once to swing the boats clear of the ship in time ofnecessity, separate means being provided for lowering each boat of theentire series operated by the swinging mechanism.

Another object of the invention is to provide means whereby the lashingsof each boat will be released at the same time when the davits start toswing out from the ship.

Another object of the invention is to provide automatic means forretarding the lowering of the boat thereby preventing accidents due totoo rapid lowering of the boats into the sea, separate means beingprovided for manually stopping the descent of the boat should that berequired at any time.

In the drawings, in which the same reference numeral is applied to thesame portion throughout the several views, there is shown one embodimentof the invention, although there may be many modifications thereof.

Figure 1 is a view in section of a portion of the boat deck of a shiphaving this davit applied thereto and showing a diagrammatic view oflife boat in place, Fig. 2 is a plan view of the parts shown in Fig. 1with the false deck removed for purposes of illustration, Fig. 3 is alongitudinal view of the boat and davit the ship deck being in sec tion,and Fig. 4 is a detail partly in section showing the brakes.

The numeral 1 illustrates the hull of th ship, 2 indicating the deck ofthe ship on which the davits 3 and 4 are supported. The davits arestepped in suitable bearings in the deck 2 as indicated at 4 and 5, thedavit 3 having a segment worm gear 6 and the davit 4 having a worm gear7, each of said gears being adjacent the bearings for the davits. Abovethe said gears there is a false deck 9 supported on stringers 10 and 11.Extending through the false deck are Specification of Letters Patent.

Application filed June 10, 1915.

Patented Feb. 29, 1916.

Serial No. 33,292.

two chock blocks12 and 13 for the support of the boat, the boat keelbeing held against said chock blocks by means of the movable chocks l4and 15 which are pivoted in bearings l6 and 17 on the main deck 2.Extending along the deck of the ship is a shaft 18, said shaft servingsuch a number of boats as it may be desired to be applied to andreceiving power from any suitable source, not shown. The shaft 18 hasfour bearings 19, 20, 21 and 22 and it is provided with two worms 23 and24, the formersliclable on a feather 25, a collar 26 on the shaftpreventing said worm 23 from moving to the left with respect to saidshaft any more than it is shown in Fig. 2. The gear 7 has a shoulder 27projecting into the hole at its center, which shoulder is intended tomeet a cam 28 on the side of the davit 4 when the gear has rotated tothe left the same amount as the gear 6 has. rotated to the right, seeFig. 2. The gear 7 is only connected with the davit 4 when its shoulder27 contacts with the cam 28 and it is used both to force the davit 4 tothe left after reaching the outboard position, as well as to pull thedavit 3 to the right when reaching its ultimate travel, the worm 23 atthat time being moved along the feather 25.

The worm 24 is rigidly connected with the shaft 18 and continuouslyrotates the gear 7 until the davit arm 4 turns as much as may benecessary to swing the boat over the side of the ship, but the worm 23is slidable on the shaft 18 so that as the davit arm 4 is rotating fromthe position in which it is pointing directly toward the gear 6 it drawsthe davit arm 3 to the right, Fig. 2, at which time the worm 23 movesalong the shaft 18, such an amount as it may be necessary to allow thearm 4 to move to the desired position, the letters A, A, B, B, C, Cindicating the successive positions of the davit arms in moving from theinboard to the outboard .positions. Below the false deck 9 and on themain deck 2 are mounted guide blocks 30-313233 for 2 slidable bars35-36. Each of the slidable bars is provided with a series of rack teethwhich teeth are in engagement with pinions 3738 on the shaft 18. Each ofthe rack bars is also provided with two hooks as indicated at 39 and 40,said hooks being for the purpose of holding the links 4142 connectingwith the lashing cables 43-44, which cables have hooks 45 and 46 passingover the gunwale of the boat B There are a pair of the lashing cablesand hooks at each end of the boat. In order to hold the teeth on thebars 3536 in engagement with pinions operating tli eni each of thebearing blocks 20 21 for the shaft 18 has a bracket H on its side, onebracket for each of the bars 35-86.

Mounted on the deck inboard from the life boat is a shaft e8, said shafthaving suitable journal bearings bolted to the deck and carrying drums49-50 for the cables 5l52, said cables passing over pulleys 53 at thetop of the davit arms, 54: at the center of the curve thereof, 55 at thetop of the straight portion thereof, and 56 on the'deck 1. The shaft l8is provided with a large pinion 58 in mesh with a small pinion 5-9 onthe shaft of the motor 'Mand said motor being controlled from the switchbox 60.

In orderto provide automatic'm'eans for preventing the boats'from beinglowered too rapidly the shaft 61 of'the motor is extended far enough tocarry the governor arm 62'63 which arms are connected with a collar 6%which collar is connected by asuitable' linkage to a vertical shaft 65havingan arm 66 connected to a band brake 67, which bears on the bottomof the brake wheel 68. The shaft 61 is also provided with a brake wheel69 around which passes the brake'band 'i'O operated by means of the'handlever7l to enable the person-"lowering the boat "to stop the" sameWhenever necessary the segment rack 7 2 providing means by' which thebrake may be left set at any desired point. i

The operation of the davit is as follows: WVhen the bc-at'is to belowered the shaft l8 is rctate'd. This first'releases the boat lashingsand the chocks by moving'the bars; 35, 36 longitudinally, the gearsmoving said bars only a short-distance. The shaft con tinues'to rotateand as it does sopositively drives the gear 6 until the davits'assu-methe position A A".' The davit in'theposition A then is met by the cam27and along with the other davit is positively rotated clockwise. Thedavit 4 ispositively rotated something over 200 degrees. lVhen" thedavits assume the positions B B it is necessary for the davit d'toro-tate about degrees, but the davit 3 may then beb'acked up because thegear 23 is freetoslide to the right on the shaft 18, but that davit willnot move as much as'the other one since some ofthe motion is lost byreason of the supporting ropes inclining in certain of the positions.When the boat has been swung out from the ship the motor or otherhoisting apparatus may be operated to raise the boat, or, if the boat isto be lowered, it may be accomplished "by operating the brake alone. i

Having thus disclosed my inventicn,what

I desire to secure by Letters Patent of the- United States, is asfollows, modifications Within thescope of the claims being expresslyreserved:

"1. A life boat handling apparatus com prising the combination with asupport for the boat, of lashing lines and chrc'ks for the boat, a pairof ships davits to which supporting cables from each end of the boatextend, a shaft extending to both of the supporting cables from each endof the boat extend, a' shaft extending to both of the davits, a slidableWorm and a fixed worm on said shaft, agear on each davit in mesh withsaid-'worms whereby the davits may betur'ned outboard, a pair of slidesfor holding the lashings and chocks, a pair of to release the lashingsand'chocks, drums over which the boat cables pass from the daVits',"-anda manually operated brake for retarding'the descent of the boat.

'pinions onthe shaft for moving said bars In testimony whereof I havehereunto'set myhandthis' 28 day of May A. D1915, in the presence of thetwo subscribedwitnesses. a p 'WILLIAM LUEDER Witnesses:

C. P. GRIFFIN, HENRY B. LESTER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

I Washington, D. C.

